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Thermal discrete dipole approximation for the description of thermal emission and radiative heat transfer of magneto-optical systems

AuthorsEkeroth, Ricardo M. Abraham; García-Martín, Antonio ; Cuevas, J. C.
Issue Date15-Jun-2017
PublisherAmerican Physical Society
CitationPhysical Review - Section B - Condensed Matter 95(23): 235428 (2017)
AbstractWe present here a generalization of the thermal discrete dipole approximation (TDDA) that allows us to describe the near-field radiative heat transfer between finite objects of arbitrary shape that exhibit magneto-optical (MO) activity. We also extend the TDDA approach to describe the thermal emission of a finite object with and without MO activity. Our method is also valid for optically anisotropic materials described by an arbitrary permittivity tensor and we provide simple closed formulas for the basic thermal quantities that considerably simplify the implementation of the TDDA method. Moreover, we show that by employing our TDDA approach one can rigorously demonstrate Kirchhoff's radiation law relating the emissivity and absorptivity of an arbitrary MO object. Our work paves the way for the theoretical study of the active control of emission and radiative heat transfer between MO systems of arbitrary size and shape.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.95.235428
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